Bubble growth for boiling bubbly flow for R141b in a serpentine tube
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
42
Journal Issue
5
Pages
727-734
Date Issued
2011
Author(s)
Abstract
Bubble growth in flow boiling of R141b in a serpentine tube was experimentally and numerically investigated. Bubble dynamics were recorded and analyzed. Bubbles formed in a straight tube experienced distinct growth phase in the next U-bend: first grew, then shrank and grew again. A single-phase flow simulation was proposed for revealing temperature and flow field in the serpentine tube. The secondary flow at bends twisted the thermal boundary layer and mix cold main stream and superheat boundary layer at wall regime. The effective superheat around the bubble interpreted the bubble behavior noted in experiments. ? 2011 Taiwan Institute of Chemical Engineers.
Subjects
Bend
Bubbly flow
Secondary flow
Serpentine tube
Type
journal article